Peril

Last updated October 13, 2026

How perils work in a policy

IRMI defines a peril as a cause of loss, and the NAIC glossary uses the same idea, describing it as the cause of property damage or personal injury. A policy's coverage often turns on whether the event that damaged the property is a covered peril.

Property policies generally take one of two approaches:

• Named perils. Only the causes of loss listed in the policy are covered. If the cause is not on the list, there is no coverage.
• Open perils. Covered property is protected against any direct physical loss unless the cause is specifically excluded. Also called all-risk in some contexts.

Example

What to watch for

• Exclusions still apply. Open perils policies commonly carve out causes such as flood or earth movement, though this depends on the form. See exclusions and endorsements that add or remove causes of loss.
• Sublimits. A peril may be covered only up to a lower sublimit.
• Multiple causes. A single event can involve more than one cause of loss. If one cause is covered and another excluded, how the policy treats the combination depends on its wording.
• Peril versus loss. The peril is the cause. The resulting damage, such as lost equipment or business interruption, is the loss, and each may have separate terms.
• Other lines use different language. Liability policies usually focus on covered claims or wrongful acts rather than named perils, and cyber policies often list covered events.

Named perils vs. open perils in more detail

The practical difference is who has to prove what. Under a named perils form, the insured generally needs to show that the loss was caused by a peril the policy lists. Under an open perils form, the starting point is reversed: direct physical loss to covered property is protected unless the insurer can point to an exclusion or limitation. That is why open perils is usually described as broader, although the exclusions, sublimits and conditions still decide what is actually paid.

The ISO commercial property program is a familiar example of the spectrum. Its causes of loss forms come in basic, broad and special versions. The basic form typically lists perils such as fire, lightning, explosion, windstorm or hail, smoke, riot, vandalism and sprinkler leakage. The broad form typically adds causes such as falling objects, weight of snow or ice, and certain kinds of water damage. The special form is generally written on an open perils basis. Other carriers use their own forms, so confirm which approach your policy takes.

"All-risk" is an older, informal name for open perils. The label can mislead, because no property policy covers every cause of loss.

Common perils and common exclusions

Perils that property policies commonly address, either as covered causes or as the starting list on a named perils form, include:

• Fire and lightning
• Windstorm and hail
• Explosion and smoke
• Theft, burglary and vandalism
• Riot and civil commotion
• Water damage from plumbing or sprinkler systems, and freezing
• Weight of ice, snow or sleet, and falling objects
• Impact from vehicles or aircraft, and collapse (often with limits)

Causes that are commonly excluded, limited or sold separately include:

• Flood and surface water
• Earthquake and other earth movement
• Wear and tear, rust and gradual deterioration
• Mechanical or electrical breakdown
• Ordinance or law, meaning the extra cost of rebuilding to current codes
• Nuclear hazard, war and similar events
• Utility or power failure that starts away from your premises

Many of these can be bought back through an endorsement or a separate policy, usually with their own limits and deductibles. Whether any cause sits on the covered or excluded side depends on the specific wording.

Peril vs. hazard vs. risk vs. loss

These four words are used loosely in conversation but have separate jobs in insurance:

• Risk is the uncertainty or possibility of a loss, and in everyday use also the property or exposure being insured.
• Hazard is a condition that increases the likelihood or severity of a loss. A physical hazard might be oily rags stored beside a heater. A moral hazard relates to the insured's honesty or incentives, and a morale hazard is carelessness that comes from having insurance.
• Peril is the cause of the loss, such as the fire itself.
• Loss is the resulting damage or financial harm, such as destroyed equipment, cleanup costs and lost income.

Picture a server closet with overloaded power strips. The overloaded circuits are a hazard. The fire they start is the peril. The burned equipment and the downtime afterward are the loss. Underwriters care about hazards when they price a risk, but the policy pays based on the peril and whether it is covered.

Perils across different types of insurance

The word "peril" belongs mostly to property insurance, but every line has its own way of deciding what triggers coverage.

• Property. Named or open perils define the causes of loss. The policy usually pays for direct physical loss to covered property, and related coverages such as business interruption typically depend on a covered cause of loss damaging covered property. This is first-party coverage, meaning it pays the policyholder for its own loss.
• Liability. General liability and similar policies respond to claims, not to a list of perils. A commercial general liability policy usually covers legal liability for bodily injury or property damage caused by an occurrence, and professional and management liability policies cover claims arising from wrongful acts. Exclusions still apply, but there is no peril list to match against. This is third-party coverage.
• Cyber. Cyber policies usually name the covered events, such as a network security failure, a data breach or an extortion demand, and then list the costs paid for each, such as forensics and notification. Many also address ransomware explicitly, sometimes with a sublimit. That is closer to a named-events approach than an open perils one. See cyber and technology E&O.
• Crime. Crime policies list covered acts, such as employee theft, forgery, funds transfer fraud and, where purchased, social engineering fraud. Each insuring agreement is its own named cause, and property forms typically do not respond to these losses. See crime and fidelity.

Special form, exclusions and causes that overlap

An open perils (special form) policy still has several layers of restriction. Exclusions remove a cause entirely. Limitations cap or narrow it. Conditions, such as keeping sprinklers or alarms in service, must be met. Sublimits cap a specific type of loss. Endorsements can add coverage back, for example a flood or earthquake sublimit, or take it away. Reading the causes-of-loss form together with every endorsement matters more than the label on the first page.

Real losses rarely have a single cause. A storm may knock out power, which causes a freeze, which bursts a pipe. Policies address this with wording on how covered and excluded causes interact. Some exclusions apply even if another cause contributes to the loss, and many policies pay for an ensuing covered loss that follows an excluded one. These rules vary by form and sometimes by state law, so a claim with more than one cause is worth raising with your broker early.

A second example: a power outage at a prototype lab

What to check before you rely on a causes-of-loss form

1. Is the policy named perils or open perils? Look for the title of the causes-of-loss form.
2. Which causes are excluded outright, and are any of them relevant to your locations, such as flood, earthquake, or wind and hail in your region?
3. Which causes are covered only up to a sublimit, and is that enough for your equipment or inventory?
4. Is equipment breakdown or electrical damage included, excluded or sold separately?
5. Does business interruption depend on a covered peril damaging your own premises, and does contingent business interruption extend to suppliers?
6. Are there conditions that could limit coverage for certain perils, such as sprinkler maintenance, protective devices or vacancy?
7. Are there separate or percentage deductibles for particular perils such as windstorm or earthquake?
8. Are data, software and digital assets covered at all, or only tangible property?
9. Do replacement cost or actual cash value terms apply to each covered peril?

Why it matters for technology, AI, fintech and digital-asset companies

Hardware makers, labs and data center operators hold costly equipment that can be damaged by causes such as fire, water, power problems or theft. Whether each cause is covered, excluded or sublimited depends on the property form, so it is worth reading the causes-of-loss wording, not just the limit. See property insurance for general background.

For AI labs and data center operators, the property exposure is concentrated in expensive, hard-to-replace hardware such as GPU clusters, cooling systems and power equipment. The perils that tend to matter most are fire, water leakage, electrical surge, and loss of power or cooling, and the last two are the ones most likely to be excluded or sublimited. Ask whether equipment breakdown is included and how spoilage or loss of cooling is treated. See data centers for more on that sector.

Crypto and digital-asset firms face a different split. Physical perils can damage hardware wallets, signing devices and servers, but the loss of digital assets themselves, for example through hacking or key compromise, usually falls outside standard property forms. It is addressed through specialized digital asset insurance or through crime and cyber policies. Fintech companies mostly meet perils as cyber events and crime acts rather than fire and wind. A property policy that responds to a burst pipe will usually not respond to a ransomware attack, which is why programs combine lines rather than relying on one form.

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